Secure form info help

I have been through the llist archives and did not find answers to my questions, so I've stopped lurking and posted.  :-)

I have a current web client that has his site on a UNIX server and has email forms in place and working now. Form data is "in the clear" and non-sensitive at this time.

He want's to add a new form that will simply send the name/addr/etc AND credit card info to a selected email securrely.

I understand that I have to place the form processor cgi files on a new SSL location on his ISP's server and that the info is secure through the "pipe" to the server from the form.  What I'm unclear about is how do I insure that the resulting email sent to his email address is ALSO secure?  Or do I have to set up an enterprise/shopping cart system?  Client does not want to involve third-party "free" hosting or anything like that, just a "simple" secure pipe from the form to his email box.

Thanks in advance,

Chuck Schwark
Westridge Consulting

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